What type of cable is used for outdoor cable trays

Type TC (Tray Cable) with outdoor-rated insulation such as XLPE or XHHW is commonly used for connecting outdoor cable trays.

Recommended Cable Types

Type T

C (Tray Cable) is the most widely used cable for outdoor cable trays. It is a factory-assembled cable with two or more insulated conductors under a non-metallic jacket, rated for 600 volts, and suitable for industrial power, control, and signal circuits. For outdoor use, Type TC cables must be supported by a messenger wire or be Type TC-ER (Exposed Run) rated, which allows short unsupported runs between trays and equipment.

XHHW/XLP or XLPE Tray Cables are also ideal for outdoor applications. These cables feature cross-linked polyethylene (XLPE) insulation and a durable jacket, providing excellent resistance to UV radiation, moisture, heat, and mechanical stress. They are suitable for wet or dry locations, direct burial, and areas exposed to sunlight or harsh weather conditions.

VNT

C (Vinyl Nylon Tray Cable) is another Type TC variant commonly used outdoors. It is cost-effective and provides good mechanical and environmental protection, though XLPE or XHHW cables offer superior UV and moisture resistance for long-term outdoor reliability. Key Features for Outdoor Tray CablesUV and Weather Resistance: Jackets made from PE, XLPE, or XHHW withstand sunlight, rain, and temperature fluctuations.

Mechanical Durability: Outdoor cables often have thicker jackets or optional armor to resist abrasion, crushing, or rodent damage. Moisture Protection: Cables should have high-integrity insulation to prevent water ingress, especially in wet or humid environments. Voltage Rating: Typically 300V for instrumentation or signal circuits and 600V for power and control circuits.

Installation Considerations

Ensure cables are continuously supported in trays and secured at intervals not exceeding six feet for exposed runs. For areas with high physical risk, consider armored Type TC cables to protect against crushing or impact. Verify that the cable is UL-listed for outdoor use and meets NEC requirements for tray installations.

By selecting Type TC tray cables with XLPE or XHHW insulation, you ensure durability, safety, and compliance for outdoor cable tray installations, while maintaining reliable power, control, or signal transmission.